gcc -o exp exp.c
gcc -o fakehelper fakehelper.c 
gcc -o fakepkexec fakepkexec.c
mv exp  /tmp/
mv fakehelper  /tmp/
mv fakepkexec /tmp/

useradd test
chown test:test /tmp/exp  /tmp/fakehelper
chown root:root /tmp/fakepkexec
chmod u+s  /tmp/fakepkexec
su test 
# then run /tmp/exp

